阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。
Education isn’t all about classrooms. Homework plays a huge role in student learning. Given how much time we spend studying in a lifetime, and how hard it is to find time to study, techniques that make studying more efficient ─ that is, techniques that allow you to learn more in the same amount of time ─ can be incredibly valuable.
One of the most important study techniques that you don’t know about is this: Space your studying.
What does that mean? If you are going to study something twice (or more), try to let as much time pass as possible between the first and second time you study. For example, don’t read your textbook chapter and then review it on the same day. Study it and then review it on a different day, and allow as much time to pass between the two study sessions as possible. Better yet, spread your studying across numerous days. You don’t necessarily have to study more, you just have to distribute your study time differently. When you sit down to study, mix up your topics ─ instead of studying one topic per day, study every topic a little bit every day.
My research team had a combined 50 years experience studying the spacing effect. We should have known better, because our prediction couldn’t have been more wrong. Spacing helped enormously.
